NeilKnows wrote on Yesterday, 08:28:
Complete IBM PS/2 Model 35 SX with Colour Monitor and Model M Keyboard...
unfortuantely the power supply in the PC is dead (apparantely a common problem) so will need some work.
If it is a Magnetek PSU like it often is, they tend go so that they are notoriously difficult or practically impossible to repair. They were built woefully underspecced and often they failed already after few years of use. I also have 35SX and it has had its PSU replaced in late 90s with a Taiwanese unit, which was a nice thing. If it is a fried Magnetek PSU, the best option might be to just replace everything with something like PicoATX unit instead of trying to hunt a working replacement PSU. Even if it is not irrepairabe now, it will be as the main fault of the unit is underspecced design. It is not simplu a capacitor or some regulator problem.
You also should be prepared to recap the floppy drive, it has most likely also failed. If the electrolyte hasn't corroded other components, it isn't a difficult job. There are posts about the drive repairs here in vogons, I also wrote something about it on this thread that was about my unit few years ago:
My IBM PS/2 model 35SX build [updated 2023-6-22]
About the floppy, you will need one as if the Dallas battery has died, which most likely has, you can't boot this thing without a setup floppy disk. Floppy interface isn't standard one, it has a 34 pin cable, but it also delivers power. So plugging a standard drive there just may get the drive and floppy controller killed. And do not plug another PS/2 floppy drive on that cable if it isn't FRU compatible with the system, you may again fry the floppy controller. There are cable adapters available so you can plug in a standard drive, but it may be janky to match the drive with the front plate and eject button hole. But at least you will be able to boot the system.
Otherwise 35SX and 40SX are probably the easiest PS/2s out there as they do have IDE controllers as well as ISA, so they are easy to expand with standard hardware unlike ESDI/MCA systems. In general these are IMO rather underwhelming systems. Original hard disks are extremely slow and loud and these computers have a lackluster performance compared to many comparable systems. For exampple, the graphics chip is just your run of the mill slow VGA on 16-bit bus, so no SVGA resolutions there. Otherwise they have many of the same reliability issues as other PS/2 models. These are painfully annoying systems, but 35/40SX are probably the easiest models thanks to least proprietary shenanigans.
And one more IBM thing still, regular 72-pin SIMMs don't work with these systems at least without modifications, you can find information about these too. If you want to expand RAM, don't focus on that until you get the system running otherwise, these kind of things are the least of worries at the point where you are.
Good luck!